i thought with the newer materials and supposed "dyno" testing most engines were considered broken in leaving the factory? i am not saying this for the aveo, but the term "broken in" means different things though. its not like there is a break in layer on the rings, or that if you tore down the engine at 10001 miles it would not be as close to factory specs as one would think. I have seen cars with 30-40k with still signs of crosshatching on the cylinder walls..

If you go to a nissan or toyota dealer with 200k miles they like to tell you the car is barely broken in (until you go to trade it in). But if the engine is built wrong it wont last nearly 10000 miles either.

If we are talking "seasoned" i know a lot of people tell you to drive easier and not at a consistent high rpm for the first 500 miles of ownership to seat the rings. And also change your oil at the 500 miles mark ( i have always done the oil change). I don't know that i believe this with factory built car either though, i "break them in" the way i am going to drive it the rest of its life.